package model;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: ling
 * Date: 2022-10-31
 * Time: 19:43
 */
public class BlogDao {
    public void insert(Blog blog) {
        Connection connection =null;
        PreparedStatement statement = null;
        try {
            connection = DBUtil.getConnection();
            String sql = "insert into blog values(null,?,?,?,now())";
            statement = connection.prepareStatement(sql);
            statement.setString(1,blog.getTitle());
            statement.setString(2,blog.getContent());
            statement.setInt(3,blog.getUserId());
            int ret =statement.executeUpdate();
            if(ret==1) {
                System.out.println("插入成功");
            } else {
                System.out.println("插入失败");
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(connection,statement,null);
        }
    }
    public List<Blog> selectAll() {
        Connection connection = null;
        PreparedStatement statement =null;
        ResultSet resultSet =null;
        List<Blog> blogs = new ArrayList<>();
        try {
            connection = DBUtil.getConnection();
            String sql = "select * from blog order by postTime desc";
            statement =connection.prepareStatement(sql);
            resultSet = statement.executeQuery();
            while(resultSet.next()) {
                Blog blog = new Blog();
                blog.setBlogId(resultSet.getInt("blogId"));
                blog.setTitle(resultSet.getString("title"));
                String content = resultSet.getString("content");
                if(content.length()>100) {
                    content = content.substring(0,100);
                }
                blog.setContent(content);
                blog.setUserId(resultSet.getInt("userId"));
                blog.setPostTime(resultSet.getTimestamp("postTime"));
                blogs.add(blog);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(connection,statement,resultSet);
        }
        return blogs;
    }
    public Blog selectOne(int blogId) {
        Connection connection = null;
        PreparedStatement statement = null;
        ResultSet resultSet =null;
        try {
            connection = DBUtil.getConnection();
            String sql = "select * from blog where blogId = ?";
            statement = connection.prepareStatement(sql);
            statement.setInt(1,blogId);
            resultSet = statement.executeQuery();
            if(resultSet.next()){
                Blog blog = new Blog();
                blog.setBlogId(resultSet.getInt("blogId"));
                blog.setTitle(resultSet.getString("title"));
                blog.setContent(resultSet.getString("content"));
                blog.setUserId(resultSet.getInt("userId"));
                blog.setPostTime(resultSet.getTimestamp("postTime"));
                return blog;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(connection,statement,resultSet);
        }
        return null;

    }
    public void delete(int blogId) {
        Connection connection = null;
        PreparedStatement statement =null;
        try {
            connection = DBUtil.getConnection();
            String sql = "delete from blog where blogId = ?";
            statement =connection.prepareStatement(sql);
            statement.setInt(1,blogId);
            int ret = statement.executeUpdate();
            if(ret==1) {
                System.out.println("删除成功");
            } else {
                System.out.println("删除失败");
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.close(connection,statement,null);
        }

    }
}
